Also, I personally cannot say Bayern Munich will fail in the Champions League this season because after all, Bayern Munich has also qualified for the quarter-finals. Therefore, there is certainly still a good chance for Bayern Munich to be able to go further and to get the trophy too, because any result can still happen and Bayern Munich should still have great ambition and morale in the Champions League.
It is better Bayern Munich to devote all of their energy to the Champions League competition, as I believe that is where their best chance of winning a trophy this season lies, rather than relying on the Bundesliga, which is currently out of reach. Their poor performance in the Bundesliga does not reflect their performance in the Champions League; even after winning the first leg match of the round of 16, they returned and scored more goals to ensure a better lead and qualification for the quarterfinals. I won't underestimate them in the Champions League because they've demonstrated to some extent that they will perform well in this league and compete for the trophy.
Tuchel will definitely prioritize the Champions League for now, because the chances of winning a trophy in the Bundesliga are very low. I think Bayern status as a respected club in the Champions League is still the same, even though they are not as favorites as Man City or Madrid. All the teams that will be Bayern opponents in the quarter finals will definitely be on full alert. With the depth of the squad they have, Bayern can show a different performance in the Champions League.
On the other hand, the big win over Mainz indicates that they are back in their best form. In the Bundesliga, Tuchel only needs to keep Bayern in second place in the standings, and ensure that the remaining matches in the future can be wiped out with a win. Bayern attention will turn completely to the Champions League, a last chance for them if they don't want to end the season empty handed.
Meanwhile, even though Bayern is not on the same level as Man City and Madrid, the opportunity for Tuchel fleet to talk a lot is quite open. Who knows, Bayern can reach the final, when many people doubt their performance, because there is no guarantee that Man City or Madrid can reach the final. Bayern has the complete attributes to trouble any team, even though they will be sacked, Tuchel definitely wants his reputation in the Champions League to remain good.